Coal-mining machinery.



PATENTED DEC. 11, 1906.

D. V. SIGKMAN. GOAL MINING MACHINERY.

APPLICATION FILED NOV. 23, 1903-.

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Zunmxtur $5 guwm PATENTED DEG. 11, 1906.

D. V. SIGKMAN. GOAL MINING MACHINERY.

APPLICATION FILED NOV. 23, 1903.

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UNITED STATES PATENT OFFICE.

COAL-MINING MACHINERY.

Specification of Letters Patent.

Patented Dec. 1 1, 1906.

1- Application filed November 23,1903. Serial no. 182.307.

To all whom it may concern:

Be it known that I, DAVY VANCE SICKMAN, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Coal-Mining Machinery; I

and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to makeand use vide suitable mechanism forengaging andautomatically releasing the ram or piston carrying the pick,whereby to render more effective the motive power in compressing the'ram-driving springs.

Another object of the invention is to so construct and arrange theseveral parts of the machine that the same may be economically producedand operated and durable and effective in use.

WVith these objects in view my invention consists in the details ofconstruction and combinations of parts hereinafter described andclaimed, particular reference being had to the accompanying drawings, inwhich- Figure 1 is a central longitudinal section, partly in elevation,of my improved. miningmachine. Fig. 2 is a plan, partly in section, ofthe same. Fig. 3 is a section on line a; m, Fig. 2. Fig. 4 is asectional view on line y y, Fig. 1, showing in plan the cam-plates foroperating the releasing mechanism, the leverrollers being shown innormal positions in full lines and in operative positions in dottedlines. Fig. 5 is a horizontal sectional view taken through thecross-head and ram, the parts being in disengaged position. Fig. 6 is anenlarged sectional view showing the ramdriving springs and theguide-rods for the ram-head. Fig. 7 is a vertical sectional view takenthrough the cross-head, the ram being in place and the operating-leversbeing shown in elevation.

The machine is supported from a metal frame comprising castings ofdefinite form having covers to inclose the working parts. As the form ofthe frame will differ to suit different requirements, no particulardescripis, toward the opening 16.

tion of such is necessary herein, it being simplynoted as a frame 1.

An electric motor 2 is suitably mounted at the rear end of the frame, tothe armatureshaft of which is fixed a bevel-pinion 3. A bevel-gear 4,centrally fixed on a shaft 5, mounted in bearings 6, rising from frame1, is suitably driven by pinion 3. The ends of shaft 5 beyond the framecarry spur-pinions 7, arranged to mesh with and drive spurgears 8, fixedon a transverse shaft 9, supported in suitable bearings 10, as shown.

Each of the gears 8 is provided with a crank-pin 11, to which is securedone end of a connecting-rod 12, the opposite end of which is secured toa cross-head 13. The crosshead, preferably in two equal verticalsections'bolted together, is mounted to reciprocate in the main framebetween guides 14. The remote face of each cross-head section isprovided with'a wrist-pin 15, projecting beyond the frame 1 andreceiving the end of the connecting-rod 12. The cross-head is formedwith a central longitudinal opening 16 and with horizontally-arrangedtransverse passages 17, communicatingwith opening 16, a vertical opening18 extending through the cross-head on each side the opening 16, saidvertical openings communicating with the passages 17 as clearly-shown inFig. 7.

A toothed dog 19 is mounted for movement in each of the passages 17 theteeth of the dogs being on the proximate facesthat Springs 20, seated inrecesses 21 in each of the dogs and bear in against the walls ofpassages 17, tend to hod the dogs normally at the limit of inwardmovement. 'Levers 22, pivotally supported at their upper ends in ears23, projecting from each cross-head section, extend downward looselythrough the openings 18 of the cross-head, passing through suitableopenings 24 in the dogs 19. The lower ends of the levers extend belowthe cross-head and are provided with rollers '25, as shown.

An auxiliary frame 26 is secured to the main frame 1, beinglongitudinally slit at its free end, as at 27, a clamping-bolt 28serving to compress the slitted end when desired. A bushing 29,preferably slitted, is held in the free end of frame 26, the wearinwhich is compensated for by a tightening of the clampingbolt 28. Thepiston or ram 30 is operative through the bushing 29, extending rearwardthrough opening 16 of the cross-head, being supported in suitablebearings.

Contiguous the bushing 29 the ram is formed with longitudinal grooves31, arranged to receive projecting ribs 32, formed interiorly of thebushing, with the result to prevent the rotation of j the ram inoperation. The ram at its point of passage through the cross-head isprovided with toothed segments 35, one at each side of the ram andpositioned to be engaged by the dogs 19. The cut of the teeth of the segments and dogs is such as to present the effective working plane towardthe rear, so that the dogs will engage and hold the segments when thedogs are moving in a rearward direction, but will slip over the teeth ofthe segj ments without holding engagement when moving in a forwarddirection. A collar 36 is secured on the ram immediately forward of thesegments 35, and encircling the ram and held between the collar and aninward extension 37 of frame 26 is a recoil-spring 38. The

rear end of the. ram is provided with a rec-l tangular head 39,preferably screwed onto a reduced end of the ram. A bearing-head 40 issecurely fastened to the main frame directly beneath the motor 2 and inhorizontal alinement with the ram-head 39. Guide-rods 41 secured in head40 and passing loosely through openings 42 in the ram-head, areencircled by springs 43, which latter are compressed between theram-head and the-bearing-head in the operation of the machineand serveto drive the ram forward to its work.

To operate the releasing mechanismthat I is, to disengage the dogs 19and segments 35- I provide camlates 44, pivoted to frame 1 at the limit0 cross-head, each cam-plate serving to operate one of the dogs throughthe medium of its lever 22. The cam-plates, two innumber, have divergentouter cam edges 45 and contiguous parallel edges 46, between the latterof which a wedge-plate 47 is arranged to enter, with the result to forcesaid edges apart and alter the angle and distance from a fixed point ofthe outer or cam edge 45 of the plates 44.

wedge-plate is slidingly held to frame 1 by a bolt 48, whereby to adjustthe wedge-plate 1tlo T e The hold the cams in a desired position. rearends of the cam-plates are to be locked in adjusted position byscrew-bolts 49, asv seen in Fig. 4. The frame is mounted upon{ wheels 50and moved by handles 51, pivotally secured to the sides of the framecontiguous the motor 2 and adjustable as to height through a slot 52 andbolt 53, as shown in Fig. 1.

rearward movement of the justment of the cam edges of the cam-platesthro'uglh operation of the wedge-plate 45 permits t e disengagement ofthe dogs and segments at various points in the travel of the cross-head,as will be evident, thus giving the operator control of the strength ofthe stroke of the ram, as a quick disengagement of the dogs and segmentswill of course operate the ram under a less tension of the springs 43than if the disengagement took place only at the limit of movement ofthe cross-head. If the machine should be so placed that the operativesurface will not receive the full strength of the force of the ram, therecoilspring 38 will receive and absorb the shock, thereby preventingdamage or strain to the machine.

In devices of the character heretofore known the operating-springs arecompressed by direct movement of cams or cranks, thereby limiting thelength of stroke, as a large sweep cam or crank would take up the powerof the motor and but little power would be available to compress thesprings. A distinction is to be noted in this construction in favor ofmy device, in that I use the full power of the motor in compressing thesprings, dispensing with the use of large cams or cranks. It will befurther noted that as the crank connection approaches a line drawnthrough its axis its throw is gradually diminished, the completion ofthe compression of the springs being about complete,

giving the crank-arm greater power just as it v is needed. I

The above description and the drawings herewith are illustrative of thepreferred embodiment of my invention, and I desire it understood that Iconsider all mechanical changes and variations as fully within the scopeof my invention.

What I claim as new is- 1. In a coal-mining machine, a ram carrying atool, springs for driving the ram forward, an electric motor,.meanscontinuously operated by the motor in the direction of movement of theram, and independentlyoperated clutches to engage the ram atdiametrically opposite points and moving the ram to compress thesprings.

2. In a coal-mining machine, a frame, a motor mounted thereon, a ramcarrying a tool, springs for driving the ram, a cross-head reciprocatedby the motor, independentlyoperated toothed dogs carried by thecrosshead, toothed segments carried by the ram and arranged to beengaged by the dogs to move the ram, levers operable to disengage thedogs and segments, and means to automatically operate the levers.

3. In a coal-mining machine, a frame, a motor mounted thereon, a ramcarrying a tool, springs for driving the ram, a cross-head reciprocatedby the motor, independentlyoperated toothed dogs carried by thecrosshead, toothed segments carried by the ram and arranged to beengaged by the dogs to move the ram, levers connected to the dogs, camsto operate the levers to disengage the dogs and segments, and means forspreading the cams to adjust them,

4, In a coalmining machine, a frame, a motor mounted thereon, a ramcarrying a tool, springs for driving the ram, a cross-head reciprocatedby the motor, toothed dogs carried by the cross-head, toothed segmentscarried by the ram and arranged to be engaged by the dogs to move theram, levers connected to the dogs, cams to operate the levers todisengage the dogs and segments, and a wedge-plate to adjust the cams.

5. In a coal-mining machine, a reciprocating cross-head, a ram movablethrough the cross-head, means interiorly of the crosshead operative atits forward limit of movement to engage the ram, means to disengage theram and cross-head at a predetermined point in the rearward movement ofthe latter, and means to project the ram forward when released from thecrosshead.

6. In a coal-mining machine, the combination with a motor, acontinuously-operated cross-head connected with and receiving power fromthe motor, a ram carrying a tool, means connecting the cross-head andram for moving the latter in one direction, means operated by the ramwhen the latter is connected to the cross-head for storing the power todrive the tool in reverse direction, and means disconnecting the ram andcross-head.

7. In a coal-mining machine, a ram carrying a tool, means for drivingthe ram and tool forward, a continuously-operated cross-head havingmechanism for engaging the ram when the cross-head is at its forwardstroke, the return movement of the cross-heade and ram compressing themeans for driving the ram and tool forward, and means disconnecting therame and cross-head.

8. In a coal-mining machine, a ram carrying a tool, springs for drivingthe ram forward, a motor, means continuously operated by the motor inthe direction of movement of the ram, said means engaging and moving theram to compress the springs, and means disengaging thecontinuously-operated means and the ram.

9. In a coal-mining machine, a movable ram carrying a tool, a cross-headcontinuously reciprocated under power, means connecting the ram andcross-head, automatically-operated means for disengaging the ram andcross-head, and a power-spring placed under tension by the ram when thelatter is connected with the cross-head and acting on the ram to drivethe latter forward when released from the cross-head.

In testimony whereof I have signed my name to this specification in thepresence of v two subscribing witnesses.

DAVY VANCE SICKMAN.

Witnesses:

A. MAEULEN, C. O. PooLE.

